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0. 'N. SMITH. Art of Uniting Eleotrotype and Stereotype Plates. No.235,034. r Patented Nov. 30,1880.

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es: la 2 /77M By NPETERS. PHOTO L1THOGRAFHER. WASNWGTON. D. C.

UNITED STATES PATENT CEEICE.

CHRIS. N. SMITH, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO JOHN C.MOBEAN, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 235,034, dated November30, 1880. Application filed July 13, 1880. (Specimen) To all whom it mayconcern Be it known that I, CHRIS. N. SMITH, a citizen of the UnitedStates of America, residing at Chicago, in the county of Cook and Stateof Illinois, have invented certain new and useful Improvements in theArt of Combining or Unitiu g Stereotype and Electrotype Plates with EachOther for Printing; and I do hereby declare that the following is afull, clear, and exact description of the invention, which, inconnection with the accompanying drawings, will enable others skilled inthe art to which it appertains to practice the same.

In the drawings, Figure 1 represents a face view of a combinedelectrotype and stereotype plate embodying my invention, and Fig. 2 asection thereof in the plane of the line as m of Fig. 1.

Like letters of reference indicate like parts.

Heretofore stereotype and electrotype plates have been combined forprinting by carefully cutting out the stereotype to receive theelectrot-ype, and by then soldering the parts together. The operation ofcutting out one plate to receive the other requires much time in orderto fit the parts nicely and properly together, and after they have beenso fitted further time and labor are spent in soldering them to eachother. By this process some difficulty has also been experienced inseparating the parts when separation was either desirable or necessary.

The object of my invention is to avoid the objections above suggested;and to that end my invention consists in the method, substantially ashereinafter set forth, which I pursue for that purposein the practice ofthe said art.

To carry my invention into effect I prepare a matrix in the usualmanner, or as when an electrotype is set in with the common type forproducing a corresponding matrix. After the matrix has been formed andthe type used therefor are ready for distribution I remove theelectrotype-plate from its block. By the electrot-ype-plate I mean theelectrotype-shell after it has been tinned on its back and provided witha backing of metal or composition in the usual manner, in order toprepare it for its block and for use in printing in connection withordinary or common type. I then place the electrotype-plate with itsface or shell downward in that part of the matrix which correspondstherewith. The matrix and the plate so arranged thereon are then placedin a casting-box, such as is commonly used in casting stereotype-plates.The box, when closed, will hold the electrotype in its place in thematrix. The stereotype metal or composition may now be run into thecasting-box,

when it will run around the electrotype-plate therein, and also intothat part of the matrix not covered or filled by the electrotype-plate.To prevent uneven contraction the electrotype-plate should be heatedbefore the stereotype composition is poured into the castingbox. By thismeans the stereotype-plate and the electrotype-plate will be firmlyunited to each other, and both may be removed from the casting-box andfrom the matrix as soon as the stereotype composition becomes set orchilled. The adjacent edges of the two plates will be nicely fittedtogether, and their outer edges will be flush and even with each other.The backs may be finished up in the usual manner, and the plates willthen be ready for use. If it should be desirable or necessary at anytime to detach these plates from each. other they may be easilyseparated.

It will be perceived from the foregoing description that I neither cutout the stereotypeplate to receive the electrotype-plate, nor use solderin connecting the different plates to each other.

As before stated, any well-known or suitable casting-box for moldingstereotype-plates 8 may be employed in carrying out or working myinvention, and the process of making both the stereotype-plate and theelectrotype-plate may be the same as heretofore; and I do not hereintend it to be understood that my invention relates in any Way eitherto the casting or to the process of making either electrotype-plates orstereotype-plates, but solely to the art of uniting such plates to beused together in printing.

In the accompanying drawings, A represents an electrotype combined witha stereotype in accordance with the mode now described. B represents thestereotype composition, and C is the electrotype. It will be perceivedthat the edges of the electrotype fit nicely into the stereotype, and.that they are partly lapped or overlaid by the latter.

Having fully described my invention, what I claim and desire to secureby Letters Patent, 1s-- The method of uniting electrotype and stereotypeplates with each other which consists in forming the matrix in the usualmanner, with the electrotype-plate in the form from which the matrix istaken, then placing the matrix so made in the casting-box with the faceof the electrotype (removed from the form) downward, and fitting; inthat portion of the matrix corresponding with it, and then pouring inthe stereotype composition so as to flow over the matrix and around theelectrotype-plate, thus securely uniting both together, substantially asdescribed.

CHRIS. N. SMITH.

Witnesses:

F. F. WARNER, W. S. BAKER.

